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Modality shares its root with the word mode, meaning the way in which something happens or is experienced. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood. In logic, modality has to do with whether a proposition is necessary, possible, or impossible.
Glossary of Grammatical and Rhetorical Terms. Languages. Definition. In English grammar, a modal is a verb that combines with another verb to indicate mood or tense. A modal (also known as a modal auxiliary or modal verb) expresses necessity, uncertainty, ability, or permission. Most linguists agree that there are 10 core or central modals in English: can, could, may, might, must, ought, shall, should, will, and would.